Medium severity · published Nov 25, 2022
CVE-2022-39338
user_oidc is an OpenID Connect user backend for Nextcloud
5.4
CVSS
0.6%
EPSS
No
On KEV
Description
user_oidc is an OpenID Connect user backend for Nextcloud. Versions prior to 1.2.1 did not properly validate discovery urls which may lead to a stored cross site scripting attack vector. The impact is limited due to the restrictive CSP that is applied on this endpoint. Additionally this vulnerability has only been shown to be exploitable in the Safari web browser. This issue has been addressed in version 1.2.1. Users are advised to upgrade. Users unable to upgrade should urge their users to avoid using the Safari web browser.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OC
Openid Connect User Backend · Nextcloud
before 1.2.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-39338
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-39338
Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5fpw-795h-rg57
Patch
https://github.com/nextcloud/user_oidc/pull/496
Permissions Required
https://hackerone.com/reports/1687410
More from Openid Connect User Backend
4.3
CVE-2022-39339
user_oidc is an OpenID Connect user backend for Nextcloud